What voltage is used to transfer electricity through the National Grid?
0%
Up to 300,000 V
0%
Up to 400,000 V
0%
Up to 500,000 V
0%
Up to 600,000 V
Q.3.
How is such a high voltage produced?
0%
By using step-up transformers
0%
By using step-down transformers
0%
By using a Darlington pair
0%
None of the above
Q.4.
Why is a high voltage used?
0%
It increases the amount of energy wasted in cables
0%
It reduces the amount of energy wasted in cables
0%
The cables cannot transfer low voltage electricity
0%
So they can transfer the electricity at a high current
Q.5.
What is the mains voltage in homes in the UK?
0%
120 V
0%
170 V
0%
230 V
0%
270 V
Q.6.
How is voltage from the National Grid changed into 230 V for home use?
0%
Step-up transformer
0%
A thin cable
0%
A thick cable
0%
Step-down transformer
Q.7.
Electricity is sent through the National Grid using which type of electrical current?
0%
Alternating current
0%
Direct current
0%
Alternating and direct current
0%
Neither alternating nor direct current
Q.8.
What voltage is produced in power stations?
0%
15,000 V
0%
20,000 V
0%
25,000 V
0%
30,000 V
Q.9.
Why don't birds get electrocuted when they stand on pylon wires?
0%
They do get electrocuted
0%
As they are not connected to any grounded point, the electricity will not flow through the bird and will continue through the cables
0%
Birds do not conduct electricity
0%
None of the above
Q.10.
Why does reducing the current and increasing the voltage mean less energy is lost?
0%
A high voltage means they can transfer the electricity at a high current, transferring it at a high current means fewer electrons travelling through the cables which reduces the amount of collisions between electrons and the cables, thus wasting less energy as heat
0%
A high voltage means they can transfer the electricity at a low current, transferring it at a low current means fewer electrons travelling through the cables which reduces the amount of collisions between electrons and the cables, thus wasting less energy as heat
0%
A high voltage means they can transfer the electricity at a low current, transferring it at a low current means more electrons travelling through the cables which reduces the amount of collisions between electrons and the cables, thus wasting less energy as heat
0%
A high voltage means they can transfer the electricity at a low current, transferring it at a low current means fewer electrons travelling through the cables which increases the amount of collisions between electrons and the cables, thus wasting less energy as heat
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